Object.dimensions doesn't support shortshands (e.g. *=) #36958

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CodeManX · 2013-10-04T20:36:52+02:00

CodeManX commented

2013-10-04 20:36:52 +02:00

%%%--- Blender version with error, and version that worked ---
r60402

- Steps for others to reproduce the error (preferably based on attached .blend file) ---

bpy.context.object.dimensions = bpy.context.object.dimensions * 3 # works
bpy.context.object.dimensions *= 3 # does nothing%%%

%%%--- Blender version with error, and version that worked --- r60402 - Steps for others to reproduce the error (preferably based on attached .blend file) --- bpy.context.object.dimensions = bpy.context.object.dimensions * 3 # works bpy.context.object.dimensions *= 3 # does nothing%%%

CodeManX commented

2013-10-04 20:36:52 +02:00

Changed status to: 'Open'

Bastien Montagne commented

2013-10-04 21:15:09 +02:00

%%%Guess that one is for Campbell too… ;)%%%

Campbell Barton commented

2013-10-05 13:15:36 +02:00

%%%Whats happening is 'dimensions' works in quite a strange way.

Dimensions reads from the object matrix, but sets the object scale.
So writing if the vector is set, then immediately read, the read value will remain unchanged.

This causes a problem for in-place multiplication since the vector is written to once for the in place multiplication, but read again for the attribute assignment.

Attached a workaround when skips the assignment if an RNA variable is assigned to its self, however I don't think its acceptable.

IMHO dimensions shouldn't even be an RNA attribute, it was only added for the interface and has problems with the order values are set in too - perhaps this could be redone in C and the rna attribute removed.%%%

%%%Whats happening is 'dimensions' works in quite a strange way. Dimensions reads from the object matrix, but sets the object scale. So writing if the vector is set, then immediately read, the read value will remain unchanged. This causes a problem for in-place multiplication since the vector is written to once for the in place multiplication, but read again for the attribute assignment. Attached a workaround when skips the assignment if an RNA variable is assigned to its self, however I don't think its acceptable. IMHO dimensions shouldn't even be an RNA attribute, it was only added for the interface and has problems with the order values are set in too - perhaps this could be redone in C and the rna attribute removed.%%%

Campbell Barton commented

2013-12-09 15:47:07 +01:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2013-12-09 15:47:07 +01:00

Campbell Barton commented

2013-12-09 15:47:07 +01:00

This is weak design on blenders part, but not going to change, I would say fix is to remove dimensions but probably this would annoy script authors too.

closing (wontfix)

This is weak design on blenders part, but not going to change, I would say fix is to remove `dimensions` but probably this would annoy script authors too. closing (wontfix)

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Object.dimensions doesn't support shortshands (e.g. *=) #36958